Side wall sample taking apparatus



Nov. 20, 1945. w. P. ORR

SIDE WALL SAMPLE TAKING APPARATUS Filed Jan. 22, 1943 F/G. g

6514/ INVENTOIL BYVQ/O MZZM A 7' TOR/VE X Patented Nov. 2%, i945 stares earner SKDE WALL SAMPLE TAKING APPARATUS Willis 1. 011-, Houston, 'Jl.ex., assignor to Standard Oil Development Company, a corporation of Delaware 2 Claims.

The present invention is directed to a wire line 7 side wall sampler.

An object of the present invention is to provide a side wall sampler which may be .operated through a conventional core bit.

is formed through both these end portions I8 and a laterally extending axle I9 is passed through i the hole and end portions l8, l8, and through It is a iurthe'r object oi thh present invention 'to provide a device which may be operated through a core bit and which is provided with a core cutting barrel arranged to be locked in a vertical position for moving through the drill stem and core bit and to be unlatched and deilected against the wall of the bore hole after the cutting barrel has passed through the core bit whereby a side wall core may be obtained.

Other objects and advantage of the present invention may be seen from a reading of the following description taken with the accompanying drawing in which I Figure 1 is an elevation of a preferred embodiment of the present invention arranged for lowering through the drill pipe;

Figure 2 is an elevation of theembodiment shown in Figure 1 in position in the lower end of the drill pipe with the upper end of the device latched to the drill stern and the cuttin barrel released from its vertical position and biased against the side of the hole in position for cutting a sample; and

Figure 3 is a view taken along line III-III of Figure 2 illustrating the mechanism adapted for forcing the free end of the cutter sideways.

Turning now specifically to the drawing it will be seen that the lower portion of drill stem II has secured thereto a conventional fish tail core bit l2 having a central opening I! for receiving cores. The opening in the bit is somewhat smallor than the inside diameter of the drill stem with ledge I4 joining the two openings together.

Some distance above the drill bit a circular ledge i is fastened on the inside of the drill stem for cooperating with the latching means of the sampling device. The arrangement above described is conventional to the art and is in general use for taking cores cut from the bottom of the hole by a core bit. I

The side wall coring device of the present invention suitable for operating through core bit I I includes a cylindrically shaped body'l8,'a core receiving barrel ll secured to the lower end of body 56 and releasable means for holding the core receiving barrel in line with body It and releasable means for latching the entire assembly to drill stem I i.

The lower end or body it is bifurcated to form end portions it, it, a laterally extending hole corresponding holes formed in the upper end of core barrel ll to secure barrel I! to member It. A coil spring 20 is arranged around axle I9 between end portions 18 with one end of the spring secured to body l6 and its other end secured to core receiving barrel ll. The coil spring is proportioned to deflect the free end of core receiving barrel l1 against the wall of the bore hole when the device is in position for receiving a core.

A latching mean is provided for retaining the longitudinal axis of barrel I! in line with. the longitudinal axis of members l6 while the device is being lowered through the drill stem. A preferred embodiment of a suitable locking means is that shown in the drawing and includes annulus 2| slidably arranged on barrel IS with members 22 extending downwardly therefrom. The upper end of sample barrel i1 is providedwith notches 24 shaped to receive the lower ends of members It will be evident that the longitudinal axis of the core receiving barrel may be lined up with the axis of body It and then latched in this position by lowering annulus 2| until the lower ends of members 22 engage notches 24. The device may then be lowered down the drill stem until core receiving barrel l1 and the lower end of member I6 have passed beyond the cutting edge of bit I2. When this position has been reached the underside of annulus 2| comes in contact with ledge l4 and further downward movement of body l6 releases members 22 from notches 24 and allows the free end of core barrel l8 to deflect against the wallv of the bore hole.

The upper end of the device is provided with a releasable latch for securing it to the drill stem while taking a sample. This latch is arranged to become operable after the coring device has moved downwardly a sufficient distance to release the core receiving barrel in the manner described in the preceding paragraph. The means for latching the sample taking device to the drill stem includes a latch 25 provided with slot 8i. Latch 25 is slidably arranged in a slot 26 in the upper end of body It and has its lower end so cured to the body by cross pin 27. A latch actuator comprising a stem 28 and bifurcated lower end portions 29 is provided with a cross pin 30 which works in the slot 3| of the latch. The

latch actuator is arranged for longitudinal movement in cylindrical passage 32 of the body of the device. The upper end or the actuator projects coring device .to the drill stem is generally conventional to the art. It will be apparent that latch 25 will be retracted within b'ody l6 as the device is lowered on a wire line but is actuated to lock the coring device. to the drill stem upon downward movement of actuator 26. It will also be evident that after a core has been taken the latch may be released by placing sufilcient tension on the wire line to move actuator 25 upwardly.

When the device is in position as shown in Figure 2 with the body latched to the drill stem and the free end of the core cutter l1 deflected against the wall of the bore hole a sample may be cut by lowering the drill stem a few inches to force the free end of barrel l1 into the side wall of the hole. drill stem may be raised in order to release the cutting barrel from the formation. The core barrel may then be released from the' drill stem by manipulation of the wire line and the barrel with its sample then withdrawn to the surface of the earth.

Having fully described a preferred embodiment of the present invention, what I desire to claim is:

l. A sample taking apparatus adapted for 80 movement along a drill stem and for taking a side wall sample through a core bit attached to a drill stem comprising in combination an elon- After the sample has been cut the a gated cylindrical body, relemsable'latching means arranged at the upper end of said body to latch it to said drill stem, a tubular shaped core barrel provided with notches in its upper end, means Journalling the upper end of said core barrel to the lower end of said body, a spring arranged to bias the free end of said core barrel away from the longitudinal axis of said body, and releasable means arranged for latching said barrel with its longitudinal axis parallel with the longitudinal axis of said body including an annulus slidingly arranged on said body and downwardly extending members secured to said annulus arranged to engage said notches on the core barrel.

2. A sample taking apparatus adapted for movement along a drill stem and for taking a side wall sample through a core bit attached to .a drill stem comprising, in combination, an elongated body, releasable means carried by said body and arranged to latch it to the drill stem, a tubular shaped core barrel, means journalling the upper end of said core barrel to the lower end of said body to form an assembly, means carried by the assembly arranged to bias the free end of the barrel away from the longitudinal axis of said body and releasable means arranged for latching said barrel with its longitudinal axis parallel with the longitudinal axis of said body, including a member slidably arranged on the body to assume an upper and a lower position and to engage with the core barrel when in its lower position,

WILLIS P. ORR. 

